Pulley



Dec. 15 1925- R. J. STOKES PULLEY Filed Nov. 25. 1922 f mew M x .H

Patented Dec. 15, 1925.

UNITED STATES,

PATENT OFFICE.

ROBERT J. STOKES, OF PRINCETON, NEXV JERSEY, ASSIGNOR TO THERMOID RUBBERCOMPANY, OF HAMILTON TOWNSHIP, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PULLEY.

Application filed November 23, 1922. Serial No. 602,833.

To all 1071 am it may 0011 car-n: 7

Be it known that I, ROBERT J. S'roKEs, a citizen of the United States,residing in Princeton, Mercer County, New Jersey, have 6 inventedcertain Improvements in Pulleys,

of which the following is a specification.

One object of my invention is to make a pulley, which will besubstantial, and which will have a high co-efiicient of friction.

A further object of the invention is to make a pulley of a compositionof asbestos fibre with a binder, molded under pressure and vulcanized.

In the accompanying drawing:

" Fig. 1 is a perspective view of my improved pulley; and

I Fig. 2 is a sectional view of the pulley.

In manufacturing my improved pulley, I

utilize the waste from brake linings and similar manufactured articles,which consists of asbestos fibre, cotton fabric and rubher, or aresinous binder. and, in many instances, pieces of fine wire. Thismaterial is ground into a tine pulp and an additional binder of rubber,or resin may be added.

if found desirable. The mass is placed in a mold of suitable shape andvulcanized under considerable pressure, producing a form such as shownin Fig. 1-. which represents a solid pulley to be used on electricmotors and other equipment.

Referring to the drawing, 1 is the body of the pulley made of the abovementioned composition. 2. is a core, which is located 'inthe body 1,prior to vulcanization. vOn

the core are projections 3, which are embedded in the material of thebody 1, as shown in Fig. 2. The core has a key-way 4 to receive a keybywhich the pulley is held from turning on the shaft.

111 some instances, the core may have a smooth, or shaped, outer surfaceand may be forced into the body 1 before or after vulcanization.

The composition of ground asbestos fibre and a binder with, or without,the cotton fibre, produces a pulley that has great strength anddurability, also a high co-eflicient of friction, which insures a goodadhesion to the driving belt.

By grinding the waste material into a fine pulp, the vulcanizable binderpenetrates the mass so that, when the pulley is molded under pressureand vulcanized, the fibres are held firmly.

I preferably use a greater proportion of asbestos fibre than cottonfibre. and, in many instances, 1 may use a composil ion, in which I finewires form part of the composition, although the wires'may 'be omittedwithout departing from the essential features of the invention.

I claim:

A pulley consisting of finely divided ground asbestos fibres, cottonfibres, iinc wires, and. a rubber binder, molded into shape andvulcanized under pressure.

ROBERT J. -S'IY )K ES.

(ill

